My primary research is in Partial Differential Equations (PDEs). We mainly study PDEs arising as models for waves on the water surface. Some famous examples of such PDEs are Korteweg de Vries (KdV), Benjamin-Bona-Mahony (BBM), Whitham, Boussinesq, Camassa-Holm, Kadomtsev-Petvishvili and Ostrovsky equations. We study stability of solutions of these PDEs.